print tables on the console

print_aligned.rb

#!/usr/bin/env ruby

def print_aligned(text, sep)
  lines = text.to_s.split("\n").map do |line|
    line.split(sep)
  end
  maxes =
    lines.inject([]) do |maxes, line|
      line.map(&:length).each_with_index do |length, index|
        if length > maxes[index].to_i
          maxes[index] = length
        end
      end
      maxes
    end
  lines.each do |fields|
    line =
      fields.each_with_index.map do |field, index|
        "%-#{maxes[index]}s"
      end.join(' ') + "\n"
    printf(line, *fields)
  end
  nil
end

<<'RUBY' # example

require 'analytics/text_utils'
include Analytics::TextUtils

table = "a,bbbbbbbbbb,c
123,0,923092384
98234,345,9"

print_aligned(table, ',')
# =>
# a     bbbbbbbbbb c
# 123   0          923092384
# 98234 345        9

RUBY

print_aligned(STDIN.read, Regexp.new(ARGV.first || "\t"))